Modelling corrosion rate of biodegradable magnesium-based alloys: The case study of Mg-Zn-RE-xCa (x = 0, 0.5, 1.5, 3 and 6 wt%) alloys

Bakhsheshi‐Rad, Hamid Reza; Abdellahi, Majid; Hamzah, Esah; Ismail, Ahmad Fauzi; Bahmanpour, Maryam

doi:10.1016/j.jallcom.2016.06.149

Cited by 53 publications

(21 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Outliers are often shown as separate dots in the line with whiskers. Taking less space as well as its ability for comparing the distribution of any data set is the main advantage of boxplot [42]. Boxplot provides the possibility of determination of the outliers the symmetricity of data, the amount of data set tightly, direction, and amount of skewed diagrams as a visual representation.…”

Section: Gep Model Resultsmentioning

confidence: 99%

Modified Particle Swarm Optimization-Artificial Neural Network and Gene Expression Programing for Predicting High Temperature Oxidation Behavior of Ni–Cr–W-Mo Alloys

Hasibi

Mahmoudian

Khayati

2020

IJE

View full text Add to dashboard Cite

This paper is an attempt to model the oxidation behavior of Ni-base alloys by considering the alloying elements, i.e., Cr, W, Mo, as variables. Modified particle swarm optimization-artificial neural network (MPSO-ANN) and gene expression programming (GEP) techniques were employed for modeling. Data set for construction of (MPSO-ANN) and GEP models selected from 66 cyclic oxidation performed in the temperature range of 400-1150 ᵒC for 27 different Ni-based alloy samples at various amounts of Cr, W, and Mo. The weight percent of alloying elements selected as input variables and the changes of weight during the oxidation cycle considered as output. To analyze the performance of proposed models, various statistical indices, viz. root mean squared error (RMSE) and the correlation coefficient between two data sets (R 2) were utilized. The collected data of GEP randomly divided into 21 training sets and 6 testing sets. The results confirmed that the possibility of oxidation behavior modeling using GEP by R 2 = 0.981, RMSE =0.0822. By consideration of oxidation resistance as criteria, Cr, Mo, and W enhanced the oxidation resistance of Ni-based alloys. The results showed that in the presence of Cr as alloying element, especially at Cr contents higher than 22 wt.%, the effect of W and Mo were negligible. However, the same trend was reversed at the sample with Cr content lower than 20 wt.%. In these cases, the effect of W and Mo on oxidation resistance were significantly enhanced.

show abstract

Section: Gep Model Resultsmentioning

confidence: 99%

Modified Particle Swarm Optimization-Artificial Neural Network and Gene Expression Programing for Predicting High Temperature Oxidation Behavior of Ni–Cr–W-Mo Alloys

Hasibi

Mahmoudian

Khayati

2020

IJE

View full text Add to dashboard Cite

show abstract

“…Some holes were observed in the matrix due to peeling of the precipitates. As for the reason of grain refinement, it was widely accepted that an alloy liquid consisting of a small amount of Ca atoms at the solid/liquid interface could form composition undercooling in the diffusion layer, in which the nucleation particles may be activated in the undercooling region, leading to forming more grain nucleation particles and refining the grain size [ 35 ]. Moreover, the Ca atoms, with low speed of diffusion, hindered the grain growth in the interfaces and limited the growth rate of crystal.…”

Section: Resultsmentioning

confidence: 99%

“…The corrosion potentials (E corr , V SCE ) and corrosion current densities ( I corr , mA/cm 2 ) were calculated from the polarization curves by the Tafel extrapolation method. The corrosion rate ( P i , mm/year) was related to corrosion current densities, according to the following equation [ 35 ]:

…”

Section: Methodsmentioning

confidence: 99%

“…Besides, the correlations of phase characteristics and degradation behaviors of Mg-xZn (x = 2, 3, 4, 5, 6) alloys were also studied in the simulated body fluid [ 1 , 31 , 32 , 33 , 34 ]. Bakhsheshi-Rad et al [ 35 , 36 , 37 ] further discussed that the corrosion behavior of Mg-0.5Ca-xZn (x = 0, 0.5, 1, 3, 4, 5, 6, 9) and Mg-2Ca-0.5Mn-xZn (x = 2, 4, 7) were improved with Zn concentration addition, whereas it would produce a reversed effect with the Zn further addition. Cho et al [ 38 ] also demonstrated that the Mn addition was beneficial to improve the degradation performance of Mg-4Zn-0.5Ca alloy, where the dense film layers of MnO and MnO 2 on the surface can inhibit the chloride ion permeation and control matrix dissolution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Homogenization on Microstructure Characteristics, Corrosion and Biocompatibility of Mg-Zn-Mn-xCa Alloys

Yuan

Lai

et al. 2018

Materials

View full text Add to dashboard Cite

The corrosion behaviors of Mg-2Zn-0.2Mn-xCa (denoted as MZM-xCa alloys) in homogenization state have been investigated by immersion test and electrochemical techniques in a simulated physiological condition. The microstructure features were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA), and the corrosion mechanism was illustrated using atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) and confocal laser scanning microscopy (CLSM). The electrochemical and immersion test verify the MZM-0.38% Ca owns the best corrosion performance with the corrosion rate of 6.27 mm/year. Furthermore, the film layer of MZM-0.38% Ca is more compact and denser than that of others. This improvement could be associated with the combined effects of the suitable content of Zn/Ca dissolving into the α-Mg matrix and the modification of Ca-containing compounds by heat-treatment. However, the morphologies were transformed from uniform corrosion to localized pitting corrosion with Ca further addition. It could be explained that the excessive Ca addition can strengthen the nucleation driving force for the second phase formation, and the large volumes fraction of micro-galvanic present interface sites accelerate the nucleation driving force for corrosion propagation. In addition, in vitro biocompatibility tests also show the MZM-0.38% Ca was safe to bone mesenchymal stem cells (BMSCs) and was promising to be utilized as implant materials.

show abstract

“…Corrosion performance is one of the major concerns for applications of magnesium alloys [6,7]. Influences of alloy elements such as Ce [8,9], Nd [9][10][11][12][13], Zn [14,15], Y [11,16], Ca [11,17], and Mn [9,11,15,[18][19][20][21][22][23] on the corrosion behavior of magnesium alloys have been investigated widely in literature. It is widely admitted that Mn addition could combat impure Fe in Mg-Al alloys and reduce corrosion rates of the Mg-Al alloys [11,18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Shan

Liu

Zeng

et al. 2019

Metals

View full text Add to dashboard Cite

Microstructure and corrosion behavior of the Mg-3Al-xMn (x = 0, 0.12, 0.21, 0.36, 0.45) (hereafter in wt.%) alloys were experimentally investigated by electron probe microanalysis (EPMA), scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), electrochemical, and hydrogen evolution tests. A new self-constructed Mg-Al-Mn-Fe thermodynamic database was used to predict the solidification paths of the alloys. The addition of Mn showed no grain refinement in the cast Mg-3Al alloys. According to the microstructure observation, Al-Fe phases were observed in the non-Mn-added alloy, while Al8Mn5(LT) (Al8Mn5 in low temperature) became the main intermetallic phase in the Mn-added alloys, and the amount increased gradually with the Mn addition. The τ–Al0.89Mn1.11 phase with lower Al/(Fe + Mn) ratio was observed in the alloys with 0.36 and 0.45 wt.% Mn content. According to the electrochemical tests, all five alloys showed localized corrosion characteristics in 3.5 wt.% NaCl solution. Compared with the Mg-3Al alloy, the corrosion resistance of Mn-added alloys were significantly improved and increased gradually with the Mn addition, which was due to the variation of Al-containing intermetallic compounds. The present experimental investigations and thermodynamic calculations confirmed the mechanism that the increasing amount of Al8Mn5(LT) with Mn addition could encapsulate the B2-Al(Mn,Fe) phase with higher Fe. Therefore, it could prevent this detrimental phase from contacting magnesium matrix, thus suppressing micro-galvanic corrosion and improving corrosion resistance gradually.

show abstract

Modelling corrosion rate of biodegradable magnesium-based alloys: The case study of Mg-Zn-RE-xCa (x = 0, 0.5, 1.5, 3 and 6 wt%) alloys

Cited by 53 publications

References 69 publications

Modified Particle Swarm Optimization-Artificial Neural Network and Gene Expression Programing for Predicting High Temperature Oxidation Behavior of Ni–Cr–W-Mo Alloys

Modified Particle Swarm Optimization-Artificial Neural Network and Gene Expression Programing for Predicting High Temperature Oxidation Behavior of Ni–Cr–W-Mo Alloys

Effect of Homogenization on Microstructure Characteristics, Corrosion and Biocompatibility of Mg-Zn-Mn-xCa Alloys

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Contact Info

Product

Resources

About